From f765952dc8b77ad36e4f624086441d290e82bf66 Mon Sep 17 00:00:00 2001 From: David Timber Date: Sun, 29 Dec 2019 01:48:14 +1100 Subject: checkpoint --- src/proone_util.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 src/proone_util.c (limited to 'src/proone_util.c') diff --git a/src/proone_util.c b/src/proone_util.c new file mode 100644 index 0000000..118dc35 --- /dev/null +++ b/src/proone_util.c @@ -0,0 +1,24 @@ +#include "proone_util.h" + + +void proone_rnd_alphanumeric_str (proone_rnd_engine_t *rnd_engine, char *str, const size_t len) { + static const char SET[] = "qwertyuiopasdfghjklzxcvbnm0123456789"; + size_t i = 0; + uint32_t n; + + if (len >= 4) { + for (; i < len / 4 * 4; i += 4) { + n = proone_rnd_gen_int(rnd_engine); + str[i + 0] = SET[((uint8_t*)&n)[0] % sizeof(SET)]; + str[i + 1] = SET[((uint8_t*)&n)[1] % sizeof(SET)]; + str[i + 2] = SET[((uint8_t*)&n)[2] % sizeof(SET)]; + str[i + 3] = SET[((uint8_t*)&n)[3] % sizeof(SET)]; + } + } + if (i < len) { + n = proone_rnd_gen_int(rnd_engine); + for (; i < len; i += 1) { + str[i] = SET[((uint8_t*)&n)[i % 4] % sizeof(SET)]; + } + } +} -- cgit